A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

A federal judge sentenced a former Arkansas judge Wednesday to five years in prison — a stiffer punishment than prosecutors recommended — after he admitted giving young male defendants lighter sentences in return for personal benefits that included sexual favours.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

In a 60 Minutes online exclusive, reporter Liz Hayes quizzed Australian Prime Minister Malcolm Turnbull on his relationship with the unpredictable Twitter aficionado and US president Donald Trump ahead of their meeting at the White House Friday.

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"Reid is one of the most ethnically-diverse seats in Australia," Mr Laundy said of his Sydney electorate.

After reeling off a list of 15 countries represented by his guests, Mr Laundy turned to political matters including education, aged care, and the disability insurance scheme.

He welcomed news the coalition government will decide during the current term on the location of a second Sydney airport. His words sparked applause from the gallery.

And he recommended someone to help with its budget.

"If the treasurer were to make my father an adviser I reckon we would be back in surplus next week," Mr Laundy quipped after recounting a childhood memory of how the hotelier had made him rewind cash till rolls inside-out so they could be re-used.

Referring to his time as a business operator, Mr Laundy said it was important to reduce red tape and regulation and even suggested that "the minister for small business should be the minister for small and family business".